Rubber tire for vehicle-wheels.



No. 642,5I3. Patented Ian. 30, I900. F. H. BOLTE.

RUBBER TIRE FOR VEHICLE WHEELS.

(Application filed Oct. 29, 1898. Renewed Jan. 5, 1900.) (No Model.)

YO issis- LNuho Trunk BQIR NITED STATES PATENT FFICE.

FRANK H. BOLTE, OF PEORIA, ILLINOIS, ASSIGNOR TO THE PEORIA RUBBER ANDMANUFACTURING COMPANY, OF SAME PLACE.

RUBBER TIRE FOR VEHICLE-WHEELS.

SPECIFICATION forming part of Letters Patent No. 642,513, dated January30, 1900.

Application filed October 29, 1898. Renewed January 5, 1900. Serial No.513. (No model.)

To (0% whom it may concern:

Be it known that I, FRANK H. BOLTE, a citi-' zen of the United States,residing at Peoria, in the county of Peoria and State of Illinois, haveinvented certain new and useful Improvements in Rubber Tires forVehicle- Wheels; and I do hereby declare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to improvements in rubber-tire construction, andmore particularly to solid or cushion tires.

The object of the invention is to incorporate in a tire means forpreventing the separation of its several parts, and especially tires inwhich these several parts are rubber of varying densities.

Furthermore, the object is to stiffen the portions, so that they are noteasily unseated from the rim of the wheel.

My invention deals particularly with a tire composed of the usual treadportion secured to a flexible base, the latter incapable of stretchingin any direction. If the tire is vulcanized while every portion of itslength is set to a smaller curve than the Wheel to receive it, with thebase forming the inside of such curve, when opened and spread upon thewheel the tread will be compressed and cannot be cut, and thereforecannot spread or gap, as in old-time construction. It is my objecttherefore to combine my invention with this kind of tire in addition tothe objects before stated. The compression above referred to is a resultof opening the tire against its unyielding base to a longer curve thanthat occupied by it when vulcanized. I am aware, however, that tires ofthis nature are not new, also that fabric has been employed in tires;but these have been claimed in separate patents and are not combined asI show them and do not accomplish the same objects as do mine.Furthermore, the fabric has not been used for the purpose of bindingtogether sections of rubber of dilferent densities. This latter object Iregard as of primary importance.

When sections of rubber differ in the manner described and arevulcanized and put under pressure or strain, they are very apt toseparate at their junctures because the molecules of rubber cannotthoroughly cohere in the vulcanizing process owing, as before stated, tothe differences in theircompositions.

It is common practice to combineahard-rubber base and a soft-rubbertread to form a tire for use on vehicle-wheels, but after a time thetread and base become separated because of the lack of a proper unitingmedium other than the vulcanized particles of the rubber.

My improvements may be understood by referring to the accompanyingdrawings, in which '6 5 Figure 1 shows a cross-section of my improvedtire. Fig. 2 is a modified form of the same. Fig. 3 shows a way ofmaking the tire by my improved method. Fig. 4 is a perspective view of asection of the tire with partsseparated to better show construction.Fig. 5 is a section of the fabric as used in the tire. Fig. 5 is asection of the fabric used in the tire, but of a slightly-modified form.Fig. 6 is a portion of the finished tire, showing its spiral form. Fig.7 is a cross-section of a reinforced base, forming, together with thefabric, a very efficient tire. Fig. 8 is a cross-section of the rind ofa wheel, showing the side strain or pressure imposed upon the tire andthe result of such pressure when using the old forms of tire. Fig. 9shows another method of forming my improved tire by cutting the sidesand inserting the binding fabric.

In the figures, A is the base, of hard rubber, and B the soft-rubbertread. Usually these have been vulcanized together without any fasteningother than the cohesive properties of the vulcanized rubber, as beforestated. These portions are consequently separable under. strain, as isshown in Fig. 8. To overcome this objection, I provide at each side ofthe tire a strip of fabric for binding the parts strongly together. Themode of constructing 5 the tire is better shown in Figs. 3 and 4, inwhich the tread portion is composed of the parts a and b. The section ais first placed upon the base A. Then the strips 0 of fabric arecemented to said portion a, as shown, and the edges thereof are broughtdown and cemented to the edges of the base. A strip b of rubber, forminga cap, is next placed over the portion a and the fabric and the edgesbrought down to the base, as indicated. In 05 Fig. 5 the fabric portionsare shown separately, so as to give a clearer idea of their shape andposition when in the tire. Fig. 5 is a cross-section of a form of thefabric in which a broad sheet of the material is employed passingentirely around under the base from sideto side, as indicated in Fig. 2in dotted lines. In this same figure the base and tread are corrugatedwhere they join. This is done inorder to obtain a larger surface ofcontact. It is possible to hold the tread and base together by thefabric only and omit the vulcanizing of the said tread and base forjoining purposes. It is evident that other means of securing the fabricto the tire portions may be usedas, for instance, in Fig. 9 the tread iscut longitudinally and the fabric let in cemented and then vulcanized,answering thereby the same as in the first method described. The fabricnot only prevents the several elements of the tire from being separated,but makes the base portion rigid, so as to prevent its being drawn fromthe rim. This is especially true when the fabric extends. entirelyaround the base, as indicatedin Figs. 2and 7. In the latter figu re Ishow the base A enlarged at its middle, said enlargement extending intothe tread portion. The advantages in this form are cheapness ofconstruction, a largervulcanizing-surface, and above all no chance forthe base portion being withdrawn from its seat or its buckling in therim, and as I am not aware of this particular improvement in tires Idesire to embody it as my own in this application. I may vulcanize thefabric to the outside of the tread instead of letting it in and may letit into the base portion. Any of such methods or those shown anddescribed will fulfil my intention.

After the tire has been provided with its fabric it is coiled in spiralform, so as to have each of its convolutions of a shorter circumferencethan the periphery of the wheel it is intended for and is thenvulcanized.

I am aware that several patents show a tire secured to the rim of theWheel by means of fabric, and still others show a fabric forstrengthening and stifiening the tread portion, but none of them showthe fabric affixed as I show it, nor do they accomplish the samepurposes as mine. Therefore I believe it is new to provide a combinationof the fabric, the non-extensible base, and soft tread as I show themand to provide tires with fabric for the purposes set forth and toreinforce the base portion as shown, for the purposes described.

Having thus described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is

1. Fora rubber vehicle-tire, a flexible,nonextensible base portion, asoft-rubber tread thereforand fabric held within such tread, extendingtherefrom and secured to such nonextensible base portion for preventingseparation of the parts as set forth.

2. Fora rubber vehicle-tire, a flexible non extensible portion,asoft-rubber tread secured thereto,and fabric vulcanized within the treadand extending therefrom and attached to said base portion for preventingthe separation of such base and tread as described.

3. A rubber tire, having a flexible non-extensible base and a soft-treadportion secured thereto, fabric held within the body of said treadportion and extending therefrom and attached to the base for preventingthe separation of those parts as set forth.

4. In a rubber tire for vehicle-Wheels, a hard-rubber base portionadapted to be secured to a wheel, a soft-rubber tread vulcanized to suchbase,fabric vulcanized Within the tread near the sides thereof,projecting therefrom and vulcanized to said base portion in such manneras to prevent the separation of the said base and tread as set forth.

5. For a rubber tire, a fiexiblenon-extensible base portion,asoft-rubber tread therefor and fabric attached to the tread and baseportion for holding such portions securely against separation as setforth.

6. In a rubber tire for vehicle-wheels, a flexible non-extensible basehaving reinforced rib extending its entire length for preventingbuckling of the tire or its withdrawal from the wheel-rim, a soft-rubbertread secured to such base, and fabric vulcanized to the base and treadfor the purposes set forth.

7. In a rubber tire, a flexible non-extensible base portion having areinforcing-rib at its middle, forming part thereof and extending itsentire length for preventing lateral bending or buckling of such tire orits withdrawal from the wheel-rim,a soft-rubber tread vulcanized to thebase and having the said rib extendinginto it and fabric extendingaround such base the edges extending into the inte rior of the tire thusconstructed and vulcanized between the said base and tread portion, asset forth.

8. In a rubber tire a flexible non-extensible base portion having atread portion vulcanized thereto, the surfaces of such base and treadportions where they join each other provided with corrugations to givestronger adhering surfaces, fabric surrounding the base transversely andvulcanized thereto; the edges thereof extending into the tire andvulcanized therein substantially as set forth and for the purposesdescribed.

9. For a rubber vehicle-tire a flexible nonextensible base portion, asoft-rubber tread vulcanized thereto and fabric vulcanized to the base,the edges thereof entering the tread portion and vulcanized thereinsubstantially as set forth and for the purposes described.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK II. BOLTE.

\Vitnesses:

A. G. SIEBERLING, MONROE SIEBERLING.

